A NEW SURGICAL MALLET.
E. R. LARNED, M.D.CHICAGO.This instrument is made entirely of metal, presenting on all sides perfectly smooth surfaces, making it as easy to sterilize as any other surgical instrument.The principal part of the mallet, the head, is made as follows: Two steel faces (D) 1% inches in diameter and 3/16 inch thick, are turned in a lathe, leaving the center 5/16 inch thick and 3/8 inch in diameter, as shown in the sketch, which is full size. The shell of the head (A) is of seamless brass tubing and fits into little recessions in the steel faces. A block of pure aluminum is turned to exactly fit the inside of the shell. This filling (B) has a hole drilled through the center 1/4 inch in diameter, through which runs a steel pin (C), the ends of which have right and left threads, the steel